Smart Grid is now widely seen as a major industry and societal evolution where the convergence of power and ICT industries and technologies is going to bring major changes in people's lifes. It is also clear that this will happen over many years and only if the standards needed for such a complex evolution are available and able to evolve over the years. After an initial phase of gap analysis and the identification of immediately applicable standards, activity in standardisation is now addressing the longer term challenges of building new standards wherever it is needed. The standards community is gradually realising that the full deployment of a variety of new applications (e.g. electrical vehicle, integration of renewables) will require a well thought architecture encompassing a variety of facets: functions, communications, security, information. The workshop will address some of the aspects of standards development with an architectural approach, from understanding the requirements and the underlying use cases to the long-term challenges posed to research.